Iron hook ramming material and castable for blast furnace

Iron hook ramming material and castable for blast furnace

There are two types of ramming materials and castables used in iron ditch. Due to the outstanding advantages of castables (long life, low consumption, and iron throughput greater than 100,000 t), the scope of use is gradually expanding, and there are many types of large and medium-sized blast furnaces. Trends in alternative ramming mixes.

(1) Ramming material. The bulk body composed of granular and powdery materials is a self-sintering shaped refractory material. It is sintered by strong ramming, and then grilled for about 40 minutes. The widely used is mainly Al2O3-SiC- C series, generally low Al2O3 (45% 55%) is matched with high SiC (10%~20%), while Al2O3 high (70%~75%) is matched with low SiC (about 3%). Small and medium blast furnaces Some of the ramming materials are not equipped with SiC materials.

The ramming material has the characteristics of good usability and convenient construction. It can be tamped with a pneumatic tamper or an electric tamper. Because it is equipped with carbon material, it should avoid direct contact with the flame when grilling.

Castable

(2) Castable. The castable is an Al2O3-SiC-C iron ditch material prepared with pure calcium aluminate cement as a binder and refractory aggregate and powder. It is formed by adding water, stirring, and vibrating. After curing and baking Use. The key to castables is to use ultrafine powder with a particle size of less than 5pm. The composition of castables used by each factory is not exactly the same. 25% of corundum, 25% of SiC20. In foreign ultra-low cement castables, 80% of Al2O3 cement only accounts for 2%, while 4% of microsilica is added, 2% of metal additives, and 0.2% of dispersants and stabilizers.

The mud for the sand mouth should be the same as the main ditch material, or even better than the main ditch material. The use of ramming material or castable should be determined according to the site conditions. On large blast furnaces, 100% of the castable material is used together with the main ditch material. Build lining.